Abstract
The magnetic properties of melt–spun amorphous Fe100−XGdX alloys were investigated over a wide concentration range (18≦X≦60). The temperature dependence of magnetization showed characteristic curves of the ferrimagnetism depending on the concentration. In the Gd-rich region, a characteristic temperature dependence of magnetization, the so-called inflection-like behavior, was observed and found to be intrinsic. Assuming 7μB of Gd moment, the Fe magnetic moment was about 2μB irrespective of the concentration and this is quite different from the result for the vapor-quenched samples. The Curie temperatures of the melt–spun samples were higher by about 70° than those of the vapor-quenched ones. The discrepancy was ascribed to that of the Fe magnetic moment and the exchange interaction constants JGd–Fe and JGd–Gd between these samples.
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